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DAVID R. QUICK Improvement in Screws.

x N0..H5,770. Pate ntedJune6,187L

.nnvrn RUFUS colon, or new roan, N. r.

IMPRGVEMEN? lN SfiREWS.

.Zo all whom, it may concern:

Be it known that I, DAVE) RUFUS QUICK, of New York, in the county of NewYork and State of New York, have invented a new and valuable Improvementin the Construction of Screws; and I do hereby declare that thefollowing is a full, clear, and exact description of the constructionand operation of the same,

' reference being had to the annexed drawing making a part of thisspecification, and to the letters and figures of reference markedthereon.

Figure l of the drawing is a plan View of my invention. Fig. 2 is atransverse section of the same. Fig. 3 is a longitudinal section.

This invention has relation to the improved construction of screws; andconsists in casting or forming them in distinct sections, with hollowhubs, and afterward coupling them together on a common shaft in such amanner as to form an unbroken line the whole extent of the thread orspiral, as well as of the hub. This invention is particularly applicableto large screws, such, for instance, as those used in flour-mills asconvey-ere, but is also of utility in constructing screws for otherpurposes.

In the accompanying drawing, illustrating the nature of this invention,A represents a hour-trough, in which revolves a screw-con.-

veyer constructed according to my improved method-that is, in sectionsB, coupled together on a single shaft, B, which passes through theirhollow hubs. 1n each section the thread, embracing a full or fractionalpart of a pitch, and the hub thereof, are cast together. The threadterminates with a radial edge, which may be slightly beveled, while theend of the hub has a clutch formation, so that when the sections arecoupled together the threads and hubs form each a continuous, unbrokenline. 0 shows screws for securing the sections B to the shaft B; but anyother method of fixing the sections rigidly in place may be adopted asanswering thesame purpose.

The clutch-couplin g of the sections obviates the necessity ofconnecting each to the shaft separately. All that is required is tosecure the end sections.

The advantages of this construction of screws are obvious. The castingof the sections is a work more readily performed than that of casting orotherwise forming the entire screw in one piece. It is economical inlarge screws, where the threads are liable to be broken or injured,since a broken or damaged section can be readily replaced by a new one.

I claim as my invention- A screw constructed in sections, havinghollowhubs bearing on a common shaft and united by clutch coupling,substantially as specified.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

DAVID RUFUS QUlCK.

l'Vit-nesses:

Annnn VAN HORN, I ELIAS B. QUICK.

